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Summary Of Significant Accounting Policies (Narrative) (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 07, 2021 | Mar. 31, 2020 | Jun. 30, 2019 USD ($) | Dec. 31, 2021 USD ($) a Customer | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Conversion of common stock into right to received per share |  | 0.5165 |  |  |  |  |
Number of customers | Customer |  |  |  |  | 2 |  | 0
Derivative collateral held |  |  |  |  | $ 0 |  |
Cash collateral posted |  |  |  |  | 0 |  |
Restricted cash |  |  |  |  | 172,000,000 | $ 190,000,000 | $ 380,000,000
Goodwill, Impairment Loss |  |  |  |  | 0 | 0 | 0
Percentage of common stock decreased |  |  | 73.00% |  |  |  |
Foreign currency translation adjustment | [1] |  |  |  |  |  | $ 1,237,000,000
Barnett Shale [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash |  |  |  |  | $ 160,000,000 | $ 190,000,000 |
Canadian Business Segment [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  | $ 1,200,000,000 |  |  |
Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Other property and equipment, useful life |  |  |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Other property and equipment, useful life |  |  |  |  | 60 years |  |
Customer Concentration Risk [Member] | OneCustomerMember | Consolidated Sales Revenue [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 19.00% | 13.00% |
Customer Concentration Risk [Member] | Two Customer [Member] | Consolidated Sales Revenue [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 12.00% | 10.00% |
Customer Concentration Risk [Member] | Minimum [Member] | OneCustomerMember | Consolidated Sales Revenue [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  | 10.00%
Customer Concentration Risk [Member] | Minimum [Member] | Major Customers [Member] | Consolidated Sales Revenue [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 10.00% |  |
Upstream Revenues [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of days allowed for payment from end of production month |  |  |  |  | 30 days |  |
Marketing Revenues [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of days allowed for payment of invoiced amount |  |  |  |  | 30 days |  |
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  | $ 1,200,000,000
CDM [Member] | QL Capital Partners, LP [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash distribution from entities |  |  |  |  | $ 14,000,000 | $ 20,000,000 | 116,000,000
Cash contributed to entities |  |  |  |  | $ 21,000,000 | $ 3,000,000 | $ 116,000,000
Devon and WPX Agreement [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Date of agreement |  | Jan. 07, 2021 |  |  | Jan. 07, 2021 |  |
Conversion of common stock into right to received per share |  | 0.5165 |  |  |  |  |
WPX and Howard Energy Partners [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Voting interest in the join venture legal entity |  |  |  |  | 50.00% |  |
Catalyst [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Area of land | a |  |  |  |  | 50,000 |  |
Investment in Catalyst |  |  |  |  | $ 368,000,000 |  |
Net assets |  |  |  |  | $ 125,000,000 |  |
[1] | In conjunction with the sale of substantially all of its oil and gas assets and operations in Canada, Devon released the cumulative translation adjustment as part of its gain on the disposition of its Canadian business. See Note 19 for additional details.

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